[PATCH 23/59] Audit: Change audit_sig_sid to audit_sig_lsm

[Casey Schaufler]

Remove lsm_export scaffolding around audit_sig_sid by
changing the u32 secid into an lsm_export structure named
audit_sig_lsm.

Signed-off-by: Casey Schaufler <casey at schaufler-ca.com>
---
 include/linux/security.h |  7 +++++++
 kernel/audit.c           | 18 ++++++++----------
 kernel/audit.h           |  2 +-
 kernel/auditsc.c         |  3 +--
 4 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/include/linux/security.h b/include/linux/security.h
index 40aa7b9f3c83..e76d7a9dbe50 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -93,6 +93,13 @@ static inline void lsm_export_init(struct lsm_export *l)
 	memset(l, 0, sizeof(*l));
 }
 
+static inline bool lsm_export_any(struct lsm_export *l)
+{
+	return (((l->flags & LSM_EXPORT_SELINUX) && l->selinux) ||
+		((l->flags & LSM_EXPORT_SMACK) && l->smack) ||
+		((l->flags & LSM_EXPORT_APPARMOR) && l->apparmor));
+}
+
 /**
  * lsm_export_secid - pull the useful secid out of a lsm_export
  * @data: the containing data structure
diff --git a/kernel/audit.c b/kernel/audit.c
index fa4c5544eb37..5226e2af9498 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -135,9 +135,9 @@ static u32	audit_backlog_limit = 64;
 static u32	audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
 
 /* The identity of the user shutting down the audit system. */
-kuid_t		audit_sig_uid = INVALID_UID;
-pid_t		audit_sig_pid = -1;
-u32		audit_sig_sid = 0;
+kuid_t			audit_sig_uid = INVALID_UID;
+pid_t			audit_sig_pid = -1;
+struct lsm_export	audit_sig_lsm;
 
 /* Records can be lost in several ways:
    0) [suppressed in audit_alloc]
@@ -1429,23 +1429,21 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 	}
 	case AUDIT_SIGNAL_INFO:
 		len = 0;
-		if (audit_sig_sid) {
-			struct lsm_export le;
-
-			lsm_export_to_all(&le, audit_sig_sid);
-			err = security_secid_to_secctx(&le, &ctx, &len);
+		if (lsm_export_any(&audit_sig_lsm)) {
+			err = security_secid_to_secctx(&audit_sig_lsm, &ctx,
+						       &len);
 			if (err)
 				return err;
 		}
 		sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
 		if (!sig_data) {
-			if (audit_sig_sid)
+			if (lsm_export_any(&audit_sig_lsm))
 				security_release_secctx(ctx, len);
 			return -ENOMEM;
 		}
 		sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
 		sig_data->pid = audit_sig_pid;
-		if (audit_sig_sid) {
+		if (lsm_export_any(&audit_sig_lsm)) {
 			memcpy(sig_data->ctx, ctx, len);
 			security_release_secctx(ctx, len);
 		}
diff --git a/kernel/audit.h b/kernel/audit.h
index 958d5b8fc1b3..64498850c52b 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -338,7 +338,7 @@ extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
 
 extern pid_t audit_sig_pid;
 extern kuid_t audit_sig_uid;
-extern u32 audit_sig_sid;
+extern struct lsm_export audit_sig_lsm;
 
 extern int audit_filter(int msgtype, unsigned int listtype);
 
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 71daead619e5..41f540037a93 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2398,8 +2398,7 @@ int audit_signal_info(int sig, struct task_struct *t)
 			audit_sig_uid = auid;
 		else
 			audit_sig_uid = uid;
-		security_task_getsecid(current, &le);
-		lsm_export_secid(&le, &audit_sig_sid);
+		security_task_getsecid(current, &audit_sig_lsm);
 	}
 
 	if (!audit_signals || audit_dummy_context())
-- 
2.19.1